brain truster

brain truster

noun
a member of a brain trust; an important but usually unofficial adviser.

Origin:
1930–35; brain trust + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
brain truster

noun
an expert adviser involved in making important decisions but usually lacking official status [syn: backroom boy
WordNet® 3.0, © 2006 by Princeton University.
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